666,276. Calculating-apparatus. VICTOR ADDING MACHINE CO. April 20, 1949 [April 22, 1948], No. 10462. Class 106 (i). In a calculating machine of the kind having an accumulator comprising intermeshing add and subtract totalizer wheels, a fugitive one entering means is provided which includes a pair of pivoted arms mounted on the same shaft and interconnected by a spring which is tensioned when either arm is rocked away from the other, one or other of the arms being rocked to tension the spring when the machine is set in the add or subtract condition and the other arm being tripped by the operative highest order totalizer wheel when it moves through zero, thereby to cause the entry of a unit of appropriate sign in the lowest order wheel. Adding and subtracting. Operation of the machine by hand or motor frees a slide 32, Fig. 1, in each denomination for rearward movement until the stem of the depressed key 26 of that denomination engages the corresponding stop lug 34 on the slide. A slidable actuator 36, coupled to the slide 32, has two racks, one of which meshes with a pinion 42 formed on a type segment 46 associated with a movable cylindrical platen 50. The other rack meshes with a toothed segment 54 coupled by a spring 62 to a second toothed segment 60 associated with a pair of intermeshing totalizer pinions 80, 82. The several pinions 80 are mounted on a shaft 86 and the pinions 82 are mounted on a shaft 88, these shafts being supported in a frame 90 which is slidable to engage the pinions 80 or 82 with the segments 60 according to whether an addition, or subtraction operation is to be performed. Transfer mechanism. When a totalizer pinion 80 or 82, Fig. 1, which is meshing with its segment 60, passes from the " 9 " position to the " 0 " position, a cam (not shown) thereon rocks a transfer pawl 68 associated with the next higher denomination and having a latch 74. A projection 66 of the pawl is thus moved from engagement with a lug 67 of the segment 60 to allow the spring 62 to advance the segment by one additional step. The pawls 68 are restored at the end of each operation by a bail 75. Fugitive one mechanism. A pair of arms 116, 117, Figs. 1 and 2, pivoted on a shaft 108 are urged together by a spring 120 but held apart by lugs 112, 126 formed on a bail 106 and a lever 122 respectively. The subtraction totalizer pinions are engaged with the segments 60 by rocking an arm 92 clockwise, the arm being bifurcated to engage a roller 98, Fig. 4, on the totalizer frame 90. The bail 106 is connected by a link 100 to the arm 92 and so, when the machine is subtracting, the lug 112 holds the arm 116 clockwise, thus tensioning the spring 120 since the lug 126 holds the arm 117 stationary. When the totalizer goes negative, the cam 83a on the highest order subtraction pinion rocks an associated pawl 132 to withdraw a lug 130 thereon from a notch in the lever 122. The arm 117 is thus released for clockwise rocking by the spring 120 and engages a lug 136 of a bail 134 to rock this clockwise also. A stud 142 in an arm 140 of the bail is thus caused to rock a pawl 146 for the lowest denomination to enable the corresponding segment 60u to advance a further step to enter one into the subtraction pinion. When the machine is adding, the arm 92 holds the bail 106 and arm 117 counterclockwise and, as the totalizer passes from a negative to a positive condition, the lever 122 is freed and the arm 116, together with the bail 134, is rocked counter-clockwise by the spring 120, thus again tripping the lowest order pawl 146 to cause an extra one to be entered into the addition pinion. The bail 134 is held in either of its two positions by a sprung detent 154. Taking negative totals and subtotals. The rocking clockwise or counterclockwise of a lever 194, Fig. 5, to condition the machine for a total or a subtotal operation, rocks a lever 174, in a known manner (not described), counterclockwise. The lever 174 carries a slide 168 which, when the totalizer is negative, is held depressed by a stud 164 in a lever 160 secured to the bail 134, Fig. 2. A stud 176 in the slide 168 is thus moved against a lug 178 of a lever 180 so that when the lever 174 rocks counterclockwise, the lever 180 is also rocked and engages a lever 200 to rock it clockwise. The lever 200 is bifurcated and embraces a stud 206 in the totalizer frame 90, which, if in the addition position, is thus moved to engage the subtraction pinions with the driving segments. The total is then taken from these pinions in known manner. When the slide 168 is depressed, a stud 182 therein is moved into a lower portion of an elbow slot 184 in a plate 186 and when the lever 174 is rocked counter-clockwise, the plate 186 is also rocked. A stud 208 in this plate is engaged by an arm 212 on a shaft 214 which also carries an arm 216, Fig. 4, which is thus rocked counterclockwise to depress a slide 222. A stud 232 in this slide rocks a lever 236 pivoted on the lever 92 to raise a hook 244 thereof out of the path of a stud 246 in a cam-plate to inhibit the normal movement of the totalizer frame to the addition position. Distinguishing marks. The plate 186, Fig. 5, which is rocked counter-clockwise in negative total- and subtotal-taking operations as described above, carries a type 190 so that a symbol " C " is printed in such operations.